Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b870c6841023d7e…

MALICIOUS

PDF

44.1 KB Created: 2020-08-03 13:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a006d6d857cab1133cdf5dacb932da SHA-1: 25586de7dad61be6221052f6869eabdcf870926e SHA-256: 7b870c6841023d7e7a01d8a60063c43a17c2dfa8a0a26efca9a42ee53b36039f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though obfuscated, contains text related to a 'booty workout plan' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=booty+workout+plan+at+home+pdf
    • http://files.pawsitivelyunleashed.com/uploads/1/3/0/9/130969710/9ea9e.pdf
    • http://files.jltreasures.com/uploads/1/3/0/7/130738893/pasoxomasem_temikiritopasab_zofedoli.pdf
    • http://files.shawnajana.com/uploads/1/3/0/8/130814258/8330540.pdf
    • http://files.devitthouse.com/uploads/1/3/0/8/130874451/79cb9298b5.pdf
    • http://files.blackridgelabradors.com/uploads/1/3/1/1/131163599/jegonufoleb_fejusoxig_xitujos_deraligafa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4178/2950/files/6184792333.pdf
    • https://cdn.shopify.com/s/files/1/0432/9842/2934/files/28144853802.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/fuwedidojigapuxivuro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0435/3910/3912/files/44381894484.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/sobatirixavazuwivirebe.pdf
    • https://cdn.shopify.com/s/files/1/0439/0171/4587/files/17843374029.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/tewagogasidotelujub.pdf
    • https://cdn.shopify.com/s/files/1/0429/7369/2063/files/jeroboremibudixodinux.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/zagupikibaden.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cb4.bin
0949a02c343364d075bf4867be71ca8d4aa2c328cfd9061051be0aaad0e5bbb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB4 5408 bytes
font_01_sfnt_off00007f0b.bin
a6bc7fec5b6aaaaafd108c457eb8f5233e80481425d29b945f1abcc3f0b457c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0B 10644 bytes